Supporting method for carboniferous soft coal seam

Abstract

The invention specifically provides a supporting method for a carboniferous soft coal seam, and aims at solving the problem that the existing permanent support for the soft coal seam is difficult to construct and influences the excavation. The method comprises the steps of a, performing temporary support through phi 22 full-length threaded steel anchoring rod lengthened anchor; b, arranging 24 phi 36*2m round steel needles to pass through the soft rock layer to fix the loosened rock; c, drilling holes in a top plate to drain water, and arranging a U29 type arched steel bracket to guide all water into a drainage channel for comprehensive treatment; d, integrally pouring concrete into the U29 type arched steel bracket, and constructing a drilling hole being 2m in width at every 1m in the bottom part so as to release the pressure from a bottom plate; e, arranging a cross beam between the bottom parts of the U29 type arched steel bracket. With the adoption of the method, the displacement deformation of a shaft in the soft rock section can be controlled, and the treatment processes such as arranging an anchoring rod in the bottom part, grouting to the bottom part, and springing blasting can be saved.

Description

technical field [0001] The invention relates to an underground supporting method of a coal mine, in particular to a supporting method for a Carboniferous soft coal seam. Background technique [0002] There are a large number of soft coal seams with large dips in the mine, large fault drops, shallow bedrock burial, and many cracks, which accept atmospheric precipitation and infiltration, making the surrounding rocks in the mine field rich in water. Due to the large amount of water in the area, the impact of loose rock formations, mudstone and soft rock formations, the surrounding rock of the entire roadway converges and deforms violently in the case of water, and the stability decreases, resulting in complex construction conditions, difficult roadway support, and slow excavation speed. If it is not guaranteed, support is required. [0003] At present, permanent support is mostly used, specifically the support of anchor rod and cable + mesh + shotcrete. The wellbore construct...

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a support method for Carboniferous soft coal seam in order to solve the problem that existing soft coal seam adopts permanent support to have construction difficulty and affect excavation

[0006] This support method effectively prevents the bottom drum problem caused by the pressure migration of the two gangs by adding beams and integral pouring; at the same time, the pressure is released through drilling to prevent the occurrence of the second bottom drum phenomenon, which overcomes the existing soft coal seam using permanent support. The protection has construction difficulties that affect the excavation

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